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In page Sigismund, Holy Roman Emperor:

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Due to his frequent absences attending to business in the other countries over which he ruled, he was obliged to consult Diets in Hungary with more frequency than his predecessors and institute the office of Palatine as chief administrator while he was away.[citation needed] In 1404, Sigismund introduced the Placetum Regium. According to this decree, Papal bulls could not be pronounced in Hungary without the consent of the king. During his long reign, the royal Buda Castle became probably the largest Gothic palace of the Late Middle Ages.[citation needed]